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<p>This study challenges conventional approaches to authentication of intersectional hybrids between the cultivated peanut (<i>Arachis hypogaea</i> L.) and the wild species <i>A. glabrata</i> Benth., achieved through an innovative in situ embryo rescue technique. Systematic phenotyping and genotyping of F₁ hybrids revealed unexpected segregation in key traits: plant architecture (erect vs. prostrate) and seed oleic acid content (high-oleic vs<i>.</i> normal-oleic). Notably, some F₁ hybrids displayed high-oleic phenotypes despite heterozygosity at <i>FAD2</i> or lacked diagnostic transposable element (TE) markers from the wild parent,&#xa0;thereby indicating potential genomic instability or epigenetic silencing. Our findings underscore the limitations of single-method hybrid authentication, advocating instead for integrated multi-locus molecular, phenotypic, and biochemical approaches. These results not only enhance our understanding of trait expression in distant hybrids but also provide insights for optimizing peanut distal hybridization breeding strategies.</p>

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First report on trait segregation in F1 hybrids between the cultivated peanut (Arachis hypogaea L.) and the wild incompatible species A. glabrata Benth.

  • 期刊论文

  • 发表日期：

    2025年5月26日

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  • Wei Jie Qi,
  • Hao Jie Sun,
  • Jing Yu,
  • Chun Jiao Jiang,
  • Guang Di Yuan,
  • Shang Xia Li,
  • Chun Yan Xu,
  • Chuan Tang Wang

摘要

This study challenges conventional approaches to authentication of intersectional hybrids between the cultivated peanut (Arachis hypogaea L.) and the wild species A. glabrata Benth., achieved through an innovative in situ embryo rescue technique. Systematic phenotyping and genotyping of F₁ hybrids revealed unexpected segregation in key traits: plant architecture (erect vs. prostrate) and seed oleic acid content (high-oleic vs. normal-oleic). Notably, some F₁ hybrids displayed high-oleic phenotypes despite heterozygosity at FAD2 or lacked diagnostic transposable element (TE) markers from the wild parent, thereby indicating potential genomic instability or epigenetic silencing. Our findings underscore the limitations of single-method hybrid authentication, advocating instead for integrated multi-locus molecular, phenotypic, and biochemical approaches. These results not only enhance our understanding of trait expression in distant hybrids but also provide insights for optimizing peanut distal hybridization breeding strategies.